For the power forum user, this bookmarklet should be used on the "Unread posts" page. It will open every unread post in a new tab for reading. Tested only in Chromium. Should work in Chrome, Firefox, & Edge.

Depending on how many unread posts there are, it will take a second or two to open them. It will only open the first page of unreads. Do not run it again until you have closed all the tabs of the previous run, otherwise it will overwrite the tabs that were left open.